Telephone substation circuit



NOV.

W. T. POWELL TELEPHONE SUBSTATION ICIIRCUIT 1 11 July 24, 1923 2 Sheets-Sheet 1 eznzmroa SHUNT -i I'- 1a L-l I to] 5PU$H BUTTON 7 v F' I G. 2

. 57 Fl (3; 3 39 INVENTOR WINFRED T. POWELL BY A2 ATTORNEY Nov. 10,1925. .726 W. T. POWELL TELEPHONE SUBSTATION CIRCUIT 1 Filed July 24, 1192 '2 5heets-$heel 2 INVENTOR WINFRED T.POWE LL ATTORNEY Patented Nov. 10, 1925. Q i i V e wmrnzn '1. 1 mm; on noqnmm amw 3:031, moron io rim :semmmm- CARLSON TELEPHONETWUEAMURINGTCOHQAM, 6F n6fiHEswmn,-T w.- oonronmn-Iolwor 1m 1031;." 1 v v e 1 I To ZZZ whom, itwmg concern: I nipn batteryautomatic telephone siihttttitih 55 a citizen. ot the Unitett States; pesid'ing i M g ,Y t "sefl;

Rochester, in the county of Monroe mitt I fisihowsthecircu t off 111 i c State- New York, "have inventettcefttin tonal-emotion in'wcmmnon'liattet new and'usefifl Improvements in Telephone 'fi' PlI SY- W'H 1g.6 SZhUWQtL'V'SifBST/J y' Substation Gimuits, of w i h th /followcirci'lit ar'nztiigemfifi for common ht ing is a full, clear, concise, and exact detelephone s' stenm mam for side toiie Scri tion- Y v h itifi 'll mid: pro vi ed e 19 'lf l leupresentinvention nelaltes't-o telephone dial h "Sp 'combmai 1g: is' a substation .ci rctiits andjhas for its purpose cn i j t; Vm' ta 65 dial, shut the provision of, circuits which my be 7' .t A V leowinflrffitigeitiefit "for side;

.L'etdily converted irom locel battery to com 111011 battery operation, 2 It is frequently. (195111131 11; in atelephone system installed: v for :local', halttel yope'isiti on to-armngethe telephone i-lgsh ltrhents so that t1Iey' n1a y be readily converted from the local battery operatiom to the .com lnolj bitt- 2O tel-y operation. Itis= also-- desirehle to zt'r range these substation circuit slso that they Talent-m1 G l's zt t'ei' may be converted for usejn an autol m t'tic Whenthi's te' telephone system,merely by intereolmectlng 'tery 't'e'l'ep'hor'ie certain terminals and by inoorporiathtgio nal is di s'connec dialsenderor impfilse tnansmiltterr In spch theci'xfetiitsy "l henmn an arrangement; it is, essent iqlthztt the imrefetf, iii" s in theh'figtl pulses generated by the Half senclendo not of'jtlie pass. through the microphone transmitter it H is also essential that the eii'ctiit'sbe s; .ar-- .Ltllgfid; that room noises, commonly kfifiwil as, ,si c'te --tone should be: mduceclf t a. minimum and in-adflition is esfeii t; a relatively 10W Voltage shout b at; all time; across the; 11m the impulsetrzi'nsniitter' c 13 2130 necessary in such; @n;.

t l'stahda rct hook-switches am Sign 11' fat di a lwslmmt springcombinationsbewemply c1osiure'of One featum. oi. this. invention. i esi'tles in tiion, is" hri D thenovel ae'r'an'gfement of the. ei nefiit's i' for othei'fieterm1 I Y 113113; The "111*" common battery telephone operaft ion. telephone tren'sn littex 14; is in additional featnre'ofi the inventji on resides br'd fioifi helifie" te'fm' 211 infile novel. arrangement of jjstlh's tation'j cit v euits'to incorporate thcdli'ali sendef o1" inipulse tiransmitten 1 t ,"Fig; 1;representsa substation eircuit' zirmngedefor localbattetyotn1agnetojOQeration." Fig 2 Shows the circuits oi 1 o r push button iefqplvfi detl 'jin converted" for common battery method of orjderft lmtf ne iat ifidfi a "rural line can operation, Fig. 3 shows the circuit of 131g. signiilfariot j'suhscriber on tliesalfie'l i-lie 1 converted-01: usefin acommonbatttel ytele- W1 ioiit i ami; will phone. system i which a. em-lie lilii rkbfe noteflt the v iottheifietweennigh e3 tel-mingle to the terminals 7 get 159 is; pend; Iiently bridge-d bridge between the line terminals 23 and 24, Y

which bridge may be traced from terminal 23 through the windings 25 and 29 of the induction coil, through normally open hook switch springs 26, transmitter-22 to the line terminal 24. ,The ringer 27 is permanently connected in a bridge including condenser 28, between the line terminals 23 and 24. Receiver i-ll and winding 30 of the induction coil are included in athirdbridge connected at one point between the ringer 27 and the condenser 28 and the other end of this bridge is connected to the hookswitch spring 26. It will be noted thatthe ground terminal (it is not connected in the circuits and the third plate of the condenser is ineffective atthis time.

\Vhen it is desired to connect the telephone of Fig. 1 forcommon battery automatic telephone operation, the terminals A. to F inclusive are interconnected in such a manner as tov produce the circuitarrangement shown in Fig.8. Itwill be noted that Fig. 3 is similar ,to the-circuits of Fig.2 except that the circuit including the receiver 33 is open at the shunt springs 34 and 35 during the operation of the dial sender.

In this arrangement also the operation oi the-dial sender closes the shunt springs 35 and 36 which place-s the telephone transmitter 37 in shunt with the impulse circuit which shunt circuit is completed at the hook switch spring 38. The mentioned impulse circuit extends from the terminal 39,- impulse springs 40, shunt springs 36 and 35, hook switch springs 38, conductor 41, windings 42 and-43 of the induction coil to the line contact 44. I J

In this instance :it will..be noted that the third plateof'tlie condenser is connected to the conductor extending between the transmitter 37 and the impulse springs 40. I11 this modification the groundtermi'nal plate is disconnected. v i

In Fig. 4' the circuitsof Fig. 1 are converted for use in an automatic common battery telephone system where" a dial sendefr having athr'ee-spring make dial shunt com- 'bination is. employed. In this arrangement the ringer 46 is permanently bridged in a circuit from line terminal through condenser 47 to the other line terminal 48. The telephone transmitter 49 is connected in a normally open bridge from the .line terminal 45, through the windings 50 and 51 of the induction coil in series,'through the hook switch springs; 52, the transmitter 49, impulse springs 50 or" the dial sender to the minal 72.

line terminal 48. 'lhe receiver 53 is in cluded in a third brldge extending from the third plate of the condenser 47, through "a winding 54 ofthe induction coil tothe hook switch spring 52.

It will be noted that .the three shunt springs 55, 56 and 57 are normally out of engagement, but when the dial sender is opof the impulse springs 50 from being heard 1n the receiver.

The closing of the contact springs 'a11d 57 complete a shunt about the transmitterso that the impulses do not pass through the telephone transmitter.

lVhen it is desired to convert the circuit arrangement of Fig. 1 to a common battery arrangement in which side tones or room noises are reduced to a minimum, the terminals A to F are interconnected in a manner to produce the circuit arrangement of Fig. 5. The ringer 60 is permanently bridged across the line terminals 59 and 61 in a circuit including the condenser 62. In the present n'io-dification, one of the plates of the" condenser remains disconnected and the terminal. Gis also not connected to ground. The telephone transmitter is bridged across the line terminals 59 and '61 in a normally open bridge extending from the terminal 59, throu'gh'windings 63 and 64, hook switch springs 65, telephone transmitter 66, line terminal 61. The telephone receiver 67 is included in a conductor connected at one end at apoint on the conductor between the condenser 62 and the ringer 60, and the other end of the receiver circuit is connected tot-he hook sw tch sprmgs 65.

WVhen the substation circuit of Fig. l is to be converted into the common battery automatic telephone type having the make-break dial sender and also arranged for side tone reduction, the terminals A to F inclusive are interconnected to. produce the circuit arrangement in Fig. 6'. This arrangementis similar to the circuits of Fig. 5 except that it is modifiedto incorporate the dial sender having a make-break shuntsprin combina tion. The ringer 7 O is permanent y bridged between line terminals 71 and 72 in. a circuit including the condenser 7 3 while the telephone transmitter 74 is connected in a normally open bridge extending from the line terminal 71 through the hook switch springs 75, windings 7 6 21116177 of the in duction coil, impulse springs 7 8 to line net- The receiver 79 is connected in a bridge including the Winding 80 of the induction coil which bridge is connected to the conductor extending between the ringer 7 O and the condenser 73. The receiver bridge extends through the normally closed shunt springs 81 and 82 of the dial sender In) t11el 0ol vfit,ch es; n will. be

n t when the-dial sender is operated, er circuit s opened soithatthe dial arenot heard n the recewer. The

noted t-l operation of the dial sender also closes con- .tact springs 82 and 8;?) which complete a shunt circuit about thetelephone transnnt i'er 74:.

Then it is desired to convert the telephone circuits ofFig. 1- for common battery automatic telephone operation with s de tone reduction and employing athree spri g make shunt dial sender theterminalsrk to F in'clus'iveare interconnected to produce a ,circuit arrangement such as is shown in Fig.

7. In thisinstance also the ringer 8-5 ispermanently connected ,tothe'lline terminals 86 and S'I tlnough' the condenser 88 and the telephone ,transnntter 89, is connected in a normall .open bridge traceable from line terminal 86' through the telephone transmitter 89, hook sW-itclrcontact 90, impulse springs ,91, windings 9,2 and 93,91 the induction coil to terminal 877. The receiver 94 is included in a l bridge with the winding 95 of the induction coil. Thisbridge is c011- nected at one end ,to the third plate Qf the condenser 88 andat ;its.o.ther end to one of the-hook switchsprings 90. It willbe noted thatthe dial shunt springs 96, Q7 and 1 98- are .norniiallyopen. NVheinlioWe er, the dial [is operated ;these three springs come into engagement to vclose shunt circuits about-the receiverald and the telephone transmitter 859;

\Vhat isclaimed is 1. In 1 a- :telephone substation ci rcuit, telephon rans itter, a r ente ignal, a th e -P t onde ser, an impul e ran iter a inel mpulse s r n s, teleph ne 116 including two conductors, a signalingjb r ss said,-condu ainclu n sa d Signal nd o o aid ond nser Pl te se on bridge across said line conductorsincluding said-telephonetransm tter and said impulse springs, a third bridge including said receiver connected across said first and said second bridges, a circuit including said impulse springs, said third plate and one of said first mentioned plates of said condenser,

and means for disabling said telephone transmitter.

said conductors in cr s sai d cendu tq s in lnd n and-twp. otsa tl ecnd ser' plate s e b i telephone trans;

3. In a telephone substation circuit; a can; phone transmitter, a receiver, a signal, a

three plate condenser, an impulsetransmit- 'ter havingimpulse springs, a telephonedin'e includ ng two conductors, a s gnalingbridge across said conductors inclu' f ng said signal vand two of said condenser plates, at second bridge across saidline' conductors including s id telephone transmitter and said. impulse springs, a third l'n'idge' including 'said receiver connected across said first andsaid sewed b e 1 a rc it 1119111 1 1155 e dm- Pulse p ngs, s d third placard; @neqf said firet lne'ntioned platesof said condenser, and ,nieans for disabling said rece verand saidlte erl cn tran m t .7 i Inateleph n ubs ation cu' e ephone trap 'itter, a lQCQlYGI, a signal, a

three-plate condenser, impulse transmitt r hati g impulse spring a d t ee hu spr ngs, a t lephonelline incl d ng Wenons a s a ig alin bridge acro aid: 1 ductors including Saidsignal and two of said condenser plates, a second bridge across d ng Sa d rte i an mi te and sane impuls gs; thud budg i uding sai ir el er n ec "e acr ss sa d fir an; seconchb l as a circuit including said impulse sprii tielwd pl te .0 said c idea, includingsaid three springs h said e iaml and tel phon transmit 5, In a telephone substationcircuit,a tele- 7 ph ne tran mi t r, rece verg'ia s g a a thre -p ate nd nser, a impulse ran r havingimimlse sprin ,a ll phone l llCl l lllg' two. conductors a d Si budge acros said nductors ndin sald er and s l mpulse ansmit er, a. 3 h df fit incl rec i r c nnec d vfi st sai 'secondbfld'ges, a circuit inc uding said 'i'mpulse springs, said third plate and one of said first mentioned plates of said condenser, and a three-spring hook switch for closing said second and third bridges. v V

6. In a telephone substation circuit, a telephone transmitter, a receiver, a signal, a three-plate condenser, an impulse transmitter having impulse springs, a telephone line including tWo conductors, a signaling bridge across said conductors including said sail third ,plateand one of iaidffirs men udingfsaid signal and two of said condenser plates, a

second bridgeacross said conductors including said telephone transmitter and said impulse springs, a third bridge connected across said first and said second bridges. and

means including certain of the plates of said condenser for reducingthe potential across said impulse springs.

p 7. In a telephone substation circuit, a telephone transmitter, a receiver, a signal, a

three-plate condenser, an impulse transmit ter having impulse springs, a telephone line including twoconductors, a signaling bridge across said conductors including said signal and two of said condenser plates, a second bridge across said conductors including said telephone transmitter and said impulse springs, a third bridge connected across said first and said second bridges, means including certain of theplates of said condenser for reducing the potential across said impulse springs, and other means for disabling said telephone transmitter during the actuation of said impulse springs.

I 8. In a telephone substation circuit, a telephone transmitter, a receiver, a signal, a three-plate condenser, an impulse transmitter having impulse springs, a telephone line including two conductors, a signaling bridge across said conductors including said signal and two of said condenser plates, a second bridge across said conductors including said telephone transmitter and said impulse springs, a third bridge connected across said first and said second bridges, means including certain of the plates of said condenser for reducing the potential across said impulse springs, and other means for shunting said telephone transmitter during the ac tuation of said impulse springs.

9. In a telephone substation circuit, a telephone transmitter, a receiver, signal, an impulse transmitter having impulse springs, a telephone line including two conductors, a signalling bridge including said signal and a capacity across said conductors during the signaling period, a second bridge across said conductors including said impulse springs, means for telephonically associating said receiver and said transmitter with said conductors, and means including a second capacity for reducing the potential across said impulse springs,

10. In a telephone substation circuit, a telephone transmitter, a receiver, a sigincluding afsecond capacity for reducing the potential across said impulse springs, and means for disabling said receiver during the operation of said impulse springs.

11. In a telephone substation net-work, (a

telephone transmitter, a receiver, a signal,

an impulse transmitter having impulse springs, telephone conductors, a signaling bridge including said signal and a capacity across said conductors during the signaling period, a second bridge across said conductors including said impulse springs, means for telephonically associating said receiver and said transmitter with. said conductors, and means includinga second capacity for reducing the potential across said impulse springs.

- 12; In a telephone substation net-work, a telephone transmitter, a receiver, a signal, an impulse transmitter having impulse springs, telephone conductors, a signaling bridge includingsaid signal and a capacity across said conductors during the signaling period, a second bridge across said conductors including said impulse springs, means for telephonically associating said receiver and said transmitter with said conductors, means including a second capacity for reducing the potential across said impulse springs, and means for disabling said receiver during the operating of said impulse springs.

In Witness whereof, I hereunto subscribe my name this 11th day of July A. D. 1923.

\VINFRED T. POIVELL. 

